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arXiv 0811.1838cond-mat.mtrl-sci
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NiFe2O4纳米粒子在polymer基质中的磁响应

Magnetic Response of NiFe2O4 nanoparticles in polymer matrix

A. Poddar, R. N. Bhowmik, Amitabha De, Pintu Sen

摘要:

我们报告的磁性纳米复合材料,由不同数量的NiFe 2 O 4纳米粒子在聚合物基体中的磁性能。纳米粒子表现出典型的磁化阻滞效应,这种效应对磁场、零场冷却/场冷却实验方式以及基体中粒子数量的变化敏感。具有较低的颗粒量的样品表现出向上翻转的磁化下降到5 K,而在较低的温度下,作为聚合物中的颗粒量的增加,磁化的阻塞占主导地位。我们研究这种磁性行为的核心和表面自旋的纳米粒子之间的竞争性磁有序,考虑到粒子间(偶极-偶极)相互作用对纳米粒子的磁动力学的影响。

英文摘要:

We report the magnetic properties of magnetic nano-composite, consisting of different quantity of NiFe2O4 nanoparticles in polymer matrix. The nanoparticles exhibited a typical magnetization blocking, which is sensitive on the variation of magnetic field, mode of zero field cooled/field cooled experiments and particle quantity in the matrix. The samples with lower particle quantity showed an upturn of magnetization down to 5 K, whereas the blocking of magnetization dominates at lower temperatures as the particle quantity increases in the polymer. We examine such magnetic behaviour in terms of the competitive magnetic ordering between core and surface spins of nanoparticles, taking into account the effect of inter-particle (dipole-dipole) interactions on nanoparticle magnetic dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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